Active Treasure Hunts

Las Vegas

Disneyland

 Paris - Floor 17 inside a yellow chair

Maui

Front Street in Lahaina - Under the right front leg of Bubba Gump's bench

In line at the Indiana Jones ride. After the part where they take your fast pass, you will see a small temple thing on the left with small barrels behind it. Right after that is a cave type thing with bamboo on the left. Reach your hand to the bottom left of the cave and you'll find an envelope. (Disney may do a thorough  job cleaning so its possible this is no longer there)